Avast uninstalls like most other programs, but leaving behind leftover files is common

To remove Avast, you go through your computer's standard uninstall process, but Avast often leaves behind folders and registry entries even after the main program is gone. The cleanest removal means uninstalling through Windows or Mac settings first, then manually deleting the remaining files. This takes about 10 to 15 minutes total.

The reason for leftover files: Avast's uninstaller is designed to preserve your settings in case you reinstall it later. If you want a complete removal — which you should do before installing a different antivirus — you need to delete those files by hand.

Key Takeaways

  • Uninstall Avast through Settings on Windows or System Settings on Mac first, which removes the main program files.
  • After uninstalling, manually delete the Avast folder from Program Files (Windows) or Applications (Mac) to remove leftover files.
  • On Windows, you may also need to delete registry entries in the Registry Editor, which stores program settings that the uninstaller leaves behind.
  • Restart your computer after deletion to clear any remaining Avast processes from memory.
  • If you cannot delete a folder because it says a file is in use, restart in Safe Mode first, then try again.

Uninstalling Avast on Windows

Step 1: Open Settings and find the Apps list. Click the Windows Start button, type "Settings" and open it. On the left side, click "Apps". Then click "Installed apps" to see your full program list.

Step 2: Find and uninstall Avast. Scroll down until you see "Avast" or "Avast One" in the list. Click on it once to highlight it. A button labeled "Uninstall" will appear to the right. Click that button. A window will pop up asking you to confirm — click "Uninstall" again.

Step 3: Wait for the uninstaller to finish. The Avast uninstaller window will open and show a progress bar. This usually takes 2 to 3 minutes. Do not close the window or restart your computer while it runs. When it finishes, click "Finish" or "Close".

At this point, the main Avast program is gone, but files remain on your hard drive. The next section covers removing those.

Removing leftover Avast files on Windows

Step 1: Open File Explorer and navigate to Program Files. Click the Windows Start button and type "File Explorer", then open it. On the left side, click "This PC". Double-click the "C:" drive (or whichever drive Windows is installed on). Then double-click the "Program Files" folder.

Step 2: Find and delete the Avast folder. Scroll through the list of folders until you see one named "Avast" or "Avast Software". Right-click on it and select "Delete". Windows will ask you to confirm — click "Yes". If Windows says the folder is in use and will not delete, skip to the Safe Mode section below.

Step 3: Empty the Recycle Bin. Right-click on the Recycle Bin icon on your desktop and select "Empty Recycle Bin". This permanently removes the deleted files.

Step 4: Delete registry entries (optional but recommended). Registry entries are hidden settings files that Windows uses to remember program information. Avast leaves these behind. To remove them, click the Windows Start button, type "Registry Editor", and open it. A warning will appear — click "Yes" to proceed. On the left side, click the folder icon next to "HKEY_LOCAL_MACHINE" to expand it. Then click the folder icon next to "SOFTWARE". Scroll down until you see a folder named "Avast" or "AVAST Software". Right-click on it and select "Delete". Click "Yes" to confirm. Close the Registry Editor window.

Uninstalling Avast on Mac

Step 1: Open System Settings and go to General. Click the Apple menu in the top-left corner and select "System Settings". On the left side, click "General".

Step 2: Find Avast in the Apps list. Click "Apps" in the left menu. Then click "Installed Apps". Scroll down until you see Avast in the list.

Step 3: Uninstall Avast. Click on Avast once to select it. A button labeled "Uninstall" will appear. Click it. Your Mac may ask for your password — type it in and click "OK". The uninstaller will run and show a progress window. Wait for it to finish, then close the window.

Like Windows, Mac leaves behind leftover files even after uninstalling. The next section shows how to remove those.

Removing leftover Avast files on Mac

Step 1: Open Finder and go to Applications. Click the Finder icon in your dock (it looks like a face). On the left side, click "Applications".

Step 2: Look for Avast folders. Scroll through the Applications folder and look for any folder or program named "Avast", "Avast One", or "Avast Security". If you see any, click on it once to select it, then press Command+Delete to move it to Trash.

Step 3: Check the Library folder for Avast files. In Finder, click "Go" in the top menu, then hold the Option key and click "Library" (it only appears while holding Option). Navigate to the "Application Support" folder. Look for any folder named "Avast" or "AVAST Software". If you find one, drag it to Trash.

Step 4: Empty the Trash. Right-click on the Trash icon in your dock and select "Empty Trash". This permanently removes the deleted files.

What to do if you cannot delete the Avast folder

If Windows says the Avast folder is in use and will not delete, the program is still running in the background. Restart your computer in Safe Mode, which loads only essential Windows files and stops Avast from running.

On Windows 10 or 11: Click the Windows Start button and type "msconfig". Open it. Click the "Boot" tab at the top. Check the box next to "Safe boot" and select "Minimal" from the dropdown. Click "OK", then click "Restart". Your computer will restart in Safe Mode. Once it boots, open File Explorer again, go to Program Files, and try deleting the Avast folder. When you are done, restart normally — go back to msconfig, uncheck "Safe boot", click "OK", and restart again.

On Mac: Restart your Mac and hold the Shift key as it boots. This starts Safe Mode. Once it finishes booting, open Finder and try deleting the Avast files again. Restart normally when you are done.

Restart your computer to finish

After you have deleted all the Avast files, restart your computer. This clears any remaining Avast processes from your computer's memory and makes sure Windows or Mac no longer tries to load any Avast components.

If you are installing a different antivirus program, do the restart before you install the new one. Running two antivirus programs at the same time causes conflicts and slows your computer down.

Frequently Asked Questions

Will uninstalling Avast leave my computer unprotected?

Yes. Windows and Mac both include basic built-in antivirus (Windows Defender on Windows, XProtect on Mac), but they offer less protection than dedicated antivirus programs. If you remove Avast, install a replacement antivirus before you go online again, or turn on Windows Defender if you are on Windows and do not plan to install something else.

What if I see an Avast icon still in my system tray after uninstalling?

Restart your computer. The icon is a leftover process that has not shut down yet. After a restart, it should be gone. If it returns after restart, a file was not fully deleted — go back to the Program Files folder and check whether the Avast folder is still there.

Can I just delete the Avast folder without uninstalling first?

You can, but it is not recommended. Uninstalling first lets the program clean up its own settings properly. If you delete the folder without uninstalling, Windows or Mac may still think Avast is installed, which can cause problems later.

Do I need to delete the registry entries on Windows?

No, but it is a good idea. Registry entries do not hurt anything if left behind, but deleting them gives you a completely clean removal. If you are not comfortable using the Registry Editor, you can skip this step and the program will still be fully gone.

Why does Avast leave files behind after uninstalling?

Avast saves your settings and license information in those files so that if you reinstall it later, your configuration is still there. The uninstaller does not delete them by default because it assumes you might want to use Avast again someday.